Sill plate of a truck



FIG. 1 is a top view of a sill plate for a truck;

FIG. 2 is an enlarged top view of a sill plate for a truck;

FIG. 3 is an enlarged front view of a sill plate for a truck; and,

FIG. 4 is an enlarged left view of a sill plate for a truck.

The bottom, right, and rear views of the sill plate are not seen during ordinary use and are not part of the claimed design. The broken lines depict environment and the elements depicted in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a sill plate of a truck, as shown and described. 